An oil pump control method, device and vehicle for an oil-cooled motor based on driving mode prediction

Abstract

The present invention provides an oil pump control method, device and vehicle for an oil-cooled motor based on driving mode prediction, including: obtaining the working temperature of the oil-cooled motor and adjusting the working gear of the oil pump according to the working temperature; obtaining the working current of the oil-cooled motor and the temperature rise rate of the working temperature, where the temperature rise rate is the temperature rise value per unit time, and increasing or decreasing the gear on the current working gear of the oil pump according to the working current and the temperature rise rate.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and particularly to an oil pump control method, device and vehicle for an oil-cooled motor based on driving mode prediction. Background Art

[0002] In the power systems of new energy vehicles and hybrid vehicles, an electronic oil pump is usually configured to meet the cooling and lubrication requirements of the power system, so that the power system operates efficiently and stably.

[0003] For existing oil-cooled drive motors, the architecture of controlling the electronic oil pump by VCU / HCU is generally adopted, which cannot achieve fine control of the oil pump, has high energy consumption / affects performance, and is not conducive to the multi-integration design of the motor controller PEU. Moreover, the existing oil pump control requires the vehicle to input driving mode information, and at the same time, the vehicle needs to calibrate the EOP separately, which increases the difficulty of integrating the electronic oil pump by the vehicle and is not conducive to product promotion (when the product is installed on a new vehicle platform, the vehicle needs to be recalibrated). In addition, the existing oil pump control mode uses the method of monitoring the oil temperature and can only perform passive detection, and cannot achieve driving mode prediction.

[0004] Patent CN113494435A discloses a control method, device and storage medium for an electronic oil pump. The invention determines the oil pump working mode based on the temperature and current of the drive motor, but does not monitor the temperature rise. Patent CN113581161A discloses an oil pump, a vehicle having the oil pump and a method for controlling the vehicle. The invention identifies and detects the oil temperature and the motor temperature, and then adjusts the rotation speed of the oil pump, without involving current monitoring. Patent CN114204752A discloses an oil temperature control method, controller, power assembly and electric vehicle. The invention only monitors the oil temperature and adjusts the flow rates of the oil pump and the water pump, without involving current and temperature rise monitoring. Summary of the Invention

[0005] In order to overcome the above technical defects, the purpose of the present invention is to provide an oil pump control method, device and vehicle for an oil-cooled motor based on driving mode prediction, in which the vehicle does not need to calibrate the oil pump separately, and different oil pump control strategies are given for different driving behaviors.

[0006] The present invention discloses an oil pump control method for an oil-cooled motor based on driving mode prediction, including: obtaining the working temperature of the oil-cooled motor, and adjusting the working gear of the oil pump according to the working temperature; obtaining the working current of the oil-cooled motor and the temperature rise rate of the working temperature, where the temperature rise rate is the temperature rise value per unit time, and increasing or decreasing the gear on the current working gear of the oil pump according to the working current and the temperature rise rate.

[0007] Preferably, adjusting the working gear of the oil pump according to the working temperature includes: when the working temperature is less than or equal to the first temperature threshold, adjusting the working gear of the oil pump to the first gear; when the working temperature is less than the second temperature threshold and greater than or equal to the first temperature threshold, adjusting the working gear of the oil pump to the second gear; when the working temperature is less than the third temperature threshold and greater than or equal to the second temperature threshold, adjusting the working gear of the oil pump to the third gear; when the working temperature is greater than or equal to the third temperature threshold, adjusting the working gear of the oil pump to the fourth gear; the oil pump speeds of the first gear, the second gear, the third gear and the fourth gear increase in sequence.

[0008] Preferably, increasing or decreasing the gear on the current working gear of the oil pump according to the working current and the temperature rise rate includes: when the working current is greater than or equal to the preset current threshold and the temperature rise rate is positive, increasing the gear on the current working gear of the oil pump; when the temperature rise rate is negative, decreasing the gear on the current working gear of the oil pump.

[0009] Preferably, when the working current is greater than or equal to the preset current threshold and the temperature rise rate is positive, increasing the gear on the current working gear of the oil pump includes: when the working current is less than the first current threshold and lasts for the first preset time, and the temperature rise rate is less than the first temperature rise rate threshold and lasts for the second preset time, maintaining the current working gear of the oil pump; when the working current is greater than or equal to the first current threshold and lasts for the first preset time, or the temperature rise rate is greater than or equal to the first temperature rise rate threshold and less than the second temperature rise rate threshold and lasts for the second preset time, performing an operation of increasing one gear on the current working gear of the oil pump; when the working current is greater than or equal to the second current threshold and lasts for the first preset time, or the temperature rise rate is greater than or equal to the second temperature rise rate threshold and lasts for the second preset time, performing an operation of increasing two gears on the current working gear of the oil pump; the second current threshold is greater than the first current threshold; the second temperature rise rate threshold is greater than the first temperature rise rate threshold.

[0010] Preferably, when the temperature rise rate is negative, decreasing the gear on the current working gear of the oil pump includes: when the temperature rise rate is greater than the third temperature rise rate threshold and lasts for the second preset time, maintaining the current working gear of the oil pump; when the temperature rise rate is greater than or equal to the fourth temperature rise rate threshold and less than the third temperature rise rate threshold and lasts for the second preset time, performing an operation of decreasing one gear on the current working gear of the oil pump; when the temperature rise rate is less than or equal to the fourth temperature rise rate threshold and lasts for the second preset time, performing an operation of decreasing two gears on the current working gear of the oil pump; the first temperature rise rate threshold is greater than the third temperature rise rate threshold which is greater than the fourth temperature rise rate threshold.

[0011] Preferably, the temperature rise rate lasting for a second preset time includes: obtaining the temperature rise rate only once within the second preset time and regarding the temperature rise rate as the temperature rise rate lasting within the second preset time; or obtaining the temperature rise rate several times within the second preset time.

[0012] Preferably, the upshifting or downshifting according to the working current and the temperature rise rate at the current working gear of the oil pump further includes: when the working current is less than the first current threshold and lasts for a first preset time, and the temperature rise rate is positive and less than the fifth temperature rise rate threshold and lasts for a second preset time, then perform a downshift operation at the current working gear of the oil pump; the fifth temperature rise rate threshold is less than the first temperature rise threshold; when the temperature rise rate is negative and greater than the sixth temperature rise rate threshold and lasts for a second preset time, then perform an upshift operation at the current working gear of the oil pump; the sixth temperature rise threshold is greater than the third temperature rise threshold.

[0013] Preferably, the upshifting or downshifting according to the working current and the temperature rise rate at the current working gear of the oil pump includes: when the working current is greater than or equal to the third current threshold and lasts for a first preset time, and the temperature rise rate is negative and greater than the seventh temperature rise rate threshold and lasts for a second preset time, then perform an upshift operation at the current working gear of the oil pump; the third current threshold is greater than or equal to the second current threshold; the seventh temperature rise rate threshold is greater than or equal to the third temperature threshold.

[0014] The present invention also discloses an oil pump control device for an oil-cooled motor based on driving mode prediction. The oil pump control device includes a data acquisition module and a processing module; the data acquisition module acquires the working temperature of the oil-cooled motor, and the processing module adjusts the working gear of the oil pump according to the working temperature; the data acquisition module acquires the working current of the oil-cooled motor and the temperature rise rate of the working temperature, the temperature rise rate is the temperature rise value per unit time, and the processing module performs upshifting or downshifting at the current working gear of the oil pump according to the working current and the temperature rise rate.

[0015] The present invention also discloses a vehicle that uses the above oil pump control method for an oil-cooled motor to control the oil pump.

[0016] After adopting the above technical solutions, compared with the prior art, the following beneficial effects are achieved:

[0017] 1. The motor controller PEU has its own driving mode judgment, which can realize the refined control of the oil pump. No VCU instructions are required, which is convenient for PEU all-in-one integration and reduces wiring harnesses. By predicting the driving mode, different oil pump control strategies are given for different driving behaviors to achieve a balance between power and economy. The vehicle of the present invention does not need to calibrate the oil pump separately, which reduces the difficulty of integrating the oil cooling system of the vehicle and facilitates the sample supply and project expansion of the oil cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A flow chart of an oil pump control method for an oil-cooled motor based on driving mode prediction provided by the present invention;

[0019] Figure 2 A flowchart of a general upshift process provided by the present invention;

[0020] Figure 3 A flow chart of a general downshift process provided by the present invention. DETAILED DESCRIPTION

[0021] The advantages of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0023] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0024] It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0025] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0026] In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, they can be mechanical connections or electrical connections, or the communication inside two elements. They can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] In the following description, the suffixes such as "module", "component" or "unit" used to represent elements are only for the convenience of describing the present invention, and they have no specific meaning themselves. Therefore, "module" and "component" can be used interchangeably.

[0028] Vehicles include motor vehicles (vehicles powered by internal combustion engines) driven by mechanical power generated by burning fuel oil (such as gasoline and diesel), and new energy vehicles driven by electricity to reduce harmful fuel emissions and improve fuel efficiency.

[0029] New energy vehicles include electric vehicles with rechargeable power sources, and the rechargeable power sources include batteries and drive motors. Among them, the drive motor rotates by using the electricity charged in the battery, and uses the rotation of the drive motor to drive the wheels. Other types of new energy vehicles include hybrid vehicles with engines, batteries and drive motors and driven by controlling the mechanical power of the engine and the power of the drive motor, and hydrogen fuel cell vehicles.

[0030] Electric vehicles have an electric oil pump for cooling the drive motor. When controlling the operation of the electric oil pump, it is usually based on the lubricating oil temperature and the operating temperature of the drive motor in the power system to control the operation of the electric oil pump. For example, when the lubricating oil temperature or the operating temperature of the drive motor reaches the set threshold, at this time the power system needs cooling and lubrication, then control the electric oil pump to start working; when both the lubricating oil temperature and the operating temperature of the drive motor do not reach the set threshold, at this time the cooling and lubrication requirements of the power system are not high, then control the electric oil pump to stop working.

[0031] The present invention discloses an oil pump control method for an oil-cooled motor based on driving mode prediction, which is applicable to a pure electric drive system (EDS) and a hybrid transmission (DHT) equipped with an oil-cooled motor. Among them, the motor is cooled by an electric oil pump (EOP). The present invention directly monitors the motor temperature, the motor temperature rise rate, and the current request parameter (requested by the motor to the electronic control) through a motor controller (PEU) to judge the current driving mode, so as to execute the oil pump speed control, without the need for the electronic control system (VCU) of a pure electric vehicle / the (hybrid) vehicle control unit (HCU) to input an oil pump control instruction. The present invention can be applied to various electric drive system structures, and realizes the speed control of the electronic oil pump by predicting the driving mode through the motor controller.

[0032] Specifically, referring to the attached Figure 1 , the oil pump control method for an oil-cooled motor based on driving mode prediction of the present invention includes:

[0033] S100. Obtain the working temperature of the oil-cooled motor, and adjust the working gear of the oil pump according to the working temperature;

[0034] S200. Obtain the working current of the oil-cooled motor and the temperature rise rate of the working temperature. The temperature rise rate is the temperature rise value per unit time, and increase or decrease the gear on the current working gear of the oil pump according to the working current and the temperature rise rate.

[0035] For the process of step S100, it can be understood as the basic mode (general mode), which is the control basis and is mainly adjusted in real time according to the working temperature of the motor. The main idea is that the higher the working temperature of the motor, the higher the oil cooling demand required, so the working efficiency of the oil pump is increased. Generally speaking, that is, the working speed of the oil pump is increased.

[0036] For the basic mode, several working gears of the oil pump can be provided, and a temperature range of the motor is preset for each working gear. When it is detected that the working temperature of the motor is in which temperature range, the oil pump gear is adjusted to the gear corresponding to this temperature range.

[0037] Preferably, the oil pump includes four working gears, and each working gear corresponds to a different temperature range. Specifically, when the working temperature is less than or equal to the first temperature threshold, the working gear of the oil pump is adjusted to the first gear; when the working temperature is less than the second temperature threshold and greater than or equal to the first temperature threshold, the working gear of the oil pump is adjusted to the second gear; when the working temperature is less than the third temperature threshold and greater than or equal to the second temperature threshold, the working gear of the oil pump is adjusted to the third gear; when the working temperature is greater than or equal to the third temperature threshold, the working gear of the oil pump is adjusted to the fourth gear. The oil pump speeds of the first gear, the second gear, the third gear, and the fourth gear increase in sequence.

[0038] For reference, the present invention provides preferred embodiments of the oil pump gear and temperature range (several temperature thresholds). The first temperature threshold is 40 degrees Celsius, the second temperature threshold is 80 degrees Celsius, and the third temperature threshold is 120 degrees Celsius. The first gear of the oil pump corresponds to an oil pump speed of 500 rpm, the second gear corresponds to an oil pump speed of 1500 rpm, the third gear corresponds to an oil pump speed of 2500 rpm, and the fourth gear corresponds to an oil pump speed of 3500 rpm. Then: when the working temperature is less than or equal to 40 degrees Celsius, the working gear of the oil pump is adjusted to the first gear with an oil pump speed of 500 rpm; when the working temperature is less than 80 degrees Celsius and greater than or equal to 40 degrees Celsius, the working gear of the oil pump is adjusted to the second gear with an oil pump speed of 1500 rpm; when the working temperature is less than 120 degrees Celsius and greater than or equal to 80 degrees Celsius, the working gear of the oil pump is adjusted to the third gear with an oil pump speed of 2500 rpm; when the working temperature is greater than or equal to the third temperature threshold, the working gear of the oil pump is adjusted to the fourth gear with an oil pump speed of 3500 rpm.

[0039] Of course, the temperature range of the working temperature of the above motor and the values of the oil pump gears are only one solution. In fact, the number of gears of the oil pump can be not only four gears, but also five or six gears, or three gears. The rotational speed of the oil pump corresponding to each gear is not necessarily the above values. Correspondingly, the temperature range of the working temperature of the motor can be not only four ranges, and moreover, the range and boundary values of each range are not necessarily the above values.

[0040] Furthermore, in the case of having the basic mode, it can only meet the working conditions of gentle driving. For the working conditions of intense driving and temperature overshoot, the adjustment strategy of step S200 needs to be adopted to ensure the vehicle power performance and avoid control lag caused by monitoring the oil temperature, thereby affecting the product performance and service life.

[0041] Generally, the adjustment strategy is (step S201): when the working current is greater than or equal to the preset current threshold and the temperature rise rate is positive, an upshift adjustment is performed on the current working gear of the oil pump; when the temperature rise rate is negative, a downshift adjustment is performed on the current working gear of the oil pump. The principle is that if the current working current of the motor is large, it means that the current power of the motor is large, and its heat generation is also more serious. And the temperature rise rate is positive, roughly indicating that the motor is still in the process of increasing the current (increasing the power and thus the heat generation tends to be more serious). At this time, an upshift is performed on the oil pump to accelerate the working efficiency of the oil pump, thereby achieving a better cooling effect on the motor. Similarly, when the temperature rise rate is negative, it roughly indicates that the motor is in the process of decreasing the current (decreasing the power and thus the heat generation tends to be alleviated). At this time, a downshift is performed on the oil pump to reduce the unnecessary work of the oil pump.

[0042] Specifically:

[0043] I. (See the appendixFigure 2 )(Step S20101) When the working current is greater than or equal to the preset current threshold and the temperature rise rate is positive, upshifting at the current working gear of the oil pump further includes the following judgment rules (the second current threshold is greater than the first current threshold; the second temperature rise rate threshold is greater than the first temperature rise rate threshold):

[0044] When the working current is less than the first current threshold and lasts for the first preset time, and the temperature rise rate is less than the first temperature rise rate threshold and lasts for the second preset time, it roughly indicates that the current output of the motor is relatively stable, then maintain the current working gear of the oil pump;

[0045] When the working current is greater than or equal to the first current threshold and lasts for the first preset time, and the temperature rise rate is greater than or equal to the first temperature rise rate threshold and less than the second temperature rise rate threshold and lasts for the second preset time, it roughly indicates that the current output of the motor tends to increase, then perform an upshift operation by one gear at the current working gear of the oil pump;

[0046] When the working current is greater than or equal to the second current threshold and lasts for the first preset time, and the temperature rise rate is greater than or equal to the second temperature rise rate threshold and lasts for the second preset time, it roughly indicates that the current output of the motor tends to be "intense", then perform an upshift operation by two gears at the current working gear of the oil pump.

[0047] As a reference, the present invention provides a preferred embodiment of upshifting. The first current threshold is 300A, the second current threshold is 400A; the first temperature rise rate threshold is 2°C / s, and the second temperature rise rate threshold is 4°C / s. The first preset time is 2 seconds, and the second preset time is 10 seconds. Then: when the working current is less than 300A and lasts for 2 seconds, and the temperature rise rate is greater than 0°C / s and less than 2°C / s and lasts for 10 seconds, then maintain the current working gear of the oil pump; when the working current is greater than or equal to 300A and lasts for 2 seconds, or the temperature rise rate is greater than or equal to 2°C / s and less than 4°C / s and lasts for 10 seconds, then perform an upshift operation by one gear at the current working gear of the oil pump; when the working current is greater than or equal to 400A and lasts for 2 seconds, or the temperature rise rate is greater than or equal to the second temperature rise rate threshold and lasts for 10 seconds, then perform an upshift operation by two gears at the current working gear of the oil pump.

[0048] Second, (see attached Figure 3 )(Step S20102) When the temperature rise rate is negative, perform a downshift adjustment at the current working gear of the oil pump. It further includes the following judgment rules (the first temperature rise rate threshold is greater than the third temperature rise rate threshold is greater than the fourth temperature rise rate threshold):

[0049] When the temperature rise rate is greater than the third temperature rise rate threshold and lasts for the second preset time, it roughly indicates that the current output of the motor is relatively stable, then maintain the current working gear of the oil pump;

[0050] When the temperature rise rate is greater than or equal to the fourth temperature rise rate threshold and less than the third temperature rise rate threshold and lasts for the second preset time, it roughly indicates that the current output of the motor tends to decrease, so a downshift operation is performed on the current working gear of the oil pump;

[0051] When the temperature rise rate is less than or equal to the fourth temperature rise rate threshold and lasts for the second preset time, it roughly indicates that the current output of the motor tends to be smaller, so a two - gear downshift operation is performed on the current working gear of the oil pump.

[0052] As a reference, the present invention gives a preferred embodiment of upshifting. The third temperature rise rate threshold is -2 °C / s, and the fourth temperature rise rate threshold is -4 °C / s. Then: when the temperature rise rate is less than 0 °C and greater than -2 °C and lasts for 10 seconds, the current working gear of the oil pump is maintained; when the temperature rise rate is greater than or equal to -4 °C and less than -2 °C and lasts for 10 seconds, a downshift operation is performed on the current working gear of the oil pump; when the temperature rise rate is less than or equal to -4 °C and lasts for 10 seconds, a two - gear downshift operation is performed on the current working gear of the oil pump.

[0053] Due to the complexity of the actual vehicle driving process, it is not uncommon to suddenly step on the accelerator (increase in motor current), so the motor temperature rise rate may change repeatedly. To cope with different driving situations, the present invention gives two implementation methods for the duration of the temperature rise rate.

[0054] First, the temperature rise rate is obtained only once within the second preset time (preferably 10 seconds), and this temperature rise rate is regarded as the temperature rise rate that persists within the second preset time. It can be understood that the time interval for obtaining the temperature rise rate each time is 10 seconds, and the temperature rise change within 10 seconds will not be considered in the regulation strategy of the oil pump.

[0055] Second, several temperature rise rates are obtained within the second preset time. This method will be more accurate and sensitive, and may also bring about the situation of repeatedly adjusting the oil pump speed.

[0056] In addition, compared with the adjustment strategy of "when the working current is greater than or equal to the preset current threshold and the temperature rise rate is positive, an upshift adjustment is performed on the current working gear of the oil pump; when the temperature rise rate is negative, a downshift adjustment is performed on the current working gear of the oil pump", in order to avoid false temperature change situations caused by environmental influence factors or external influence factors, the present invention also proposes (the fifth temperature rise rate threshold is less than the first temperature threshold; the sixth temperature threshold is greater than the third temperature threshold) (step S202): when the working current is less than the first current threshold and lasts for the first preset time, and the temperature rise rate is positive and less than the fifth temperature rise rate threshold and lasts for the second preset time, a downshift operation is performed on the current working gear of the oil pump; when the temperature rise rate is negative and greater than the sixth temperature rise rate threshold and lasts for the second preset time, an upshift operation is performed on the current working gear of the oil pump.

[0057] That is, when the working current of the motor is at a relatively low level, the temperature rise rate is positive but very small (the temperature rises slowly). At this time, it is considered a false temperature rise. Then, for the protection of the oil pump and energy saving, a downshift operation is performed at the current working gear of the oil pump. When the temperature rise rate is negative and very small (the temperature drops slowly), it is considered a false temperature drop. Then, considering the cooling efficiency of the motor, an upshift operation is performed at the current working gear of the oil pump.

[0058] In a preferred example, the fifth temperature rise rate threshold is 0.5 °C / s, and the sixth temperature threshold is -0.5 °C / s. Then: when the working current is less than 300 A and lasts for 2 seconds, and the temperature rise rate is greater than 0 °C / s and less than 0.5 °C / s and lasts for 10 seconds, a downshift operation is performed at the current working gear of the oil pump. When the temperature rise rate is less than 0 °C / s and greater than -0.5 °C / s and lasts for 10 seconds, an upshift operation is performed at the current working gear of the oil pump.

[0059] In addition, compared with the adjustment strategy of "when the working current is greater than or equal to the preset current threshold and the temperature rise rate is positive, an upshift adjustment is performed at the current working gear of the oil pump; when the temperature rise rate is negative, a downshift adjustment is performed at the current working gear of the oil pump", and the above "false temperature rise / fall" adjustment strategy, considering the insufficient cooling effect of the oil pump, the present invention also proposes (the third current threshold is greater than or equal to the second current threshold; the seventh temperature rise rate threshold is greater than or equal to the third temperature threshold) (step S203): when the working current is greater than or equal to the third current threshold and lasts for the first preset time, and the temperature rise rate is negative and greater than the seventh temperature rise rate threshold and lasts for the second preset time, an upshift operation is performed at the current working gear of the oil pump.

[0060] That is, when the working current of the motor is at a relatively high level, and the temperature cooling efficiency at this time is very low (reflected in the temperature rise rate being negative and greater than the seventh temperature rise rate threshold, and the seventh temperature rise rate threshold is greater than or equal to the third temperature threshold), then at this time, it is necessary to increase the cooling effect, that is, perform an upshift operation on the oil pump.

[0061] In a preferred example, the third current threshold is 450 A, and the seventh temperature rise rate threshold is -1 °C / s. Then: when the working current is greater than or equal to 450 A and lasts for 2 seconds, and the temperature rise rate is less than 0 and greater than -1 °C / s and lasts for 10 seconds, an upshift operation is performed at the current working gear of the oil pump.

[0062] Based on the driving mode judgment carried by the motor controller PEU, the present invention can achieve refined control of the oil pump without the need for VCU instructions, facilitating the multi-integration of PEU and reducing the wiring harness; through the prediction of the driving mode, different oil pump control strategies are given for different driving behaviors to achieve the balance between power performance and economy; moreover, the whole vehicle of the present invention does not need to be separately calibrated for the oil pump, reducing the difficulty of integrating the oil cooling system for the whole vehicle and facilitating the sample supply and project expansion of the oil cooling system.

[0063] The present invention also discloses an oil pump control device for an oil-cooled motor based on driving mode prediction. The oil pump control device includes a data acquisition module and a processing module. The data acquisition module is used to obtain the working temperature of the oil-cooled motor, and the processing module adjusts the working gear of the oil pump according to the working temperature; the data acquisition module also obtains the working current of the oil-cooled motor and the temperature rise rate of the working temperature, and the processing module increases or decreases the gear on the current working gear of the oil pump according to the working current and the temperature rise rate to implement the basic mode and adjustment strategy of the above oil pump control method.

[0064] The present invention also discloses a vehicle that uses the above oil pump control method for an oil-cooled motor to control the oil pump.

[0065] It should be noted that the embodiments of the present invention have good implementability and are not limited in any form. Any person skilled in the art may use the disclosed technical content to change or modify it into an equivalent effective embodiment. However, as long as it does not depart from the technical content of the present invention, any modification, equivalent change or modification made to the above embodiments based on the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A control method for the oil pump of an oil-cooled motor based on driving mode prediction, which monitors the motor temperature, the motor temperature rise rate, and the current request parameter requested by the motor from the motor controller through the motor controller to determine the current driving mode, so as to execute the oil pump speed control. Characterized in that, It includes: Obtain the working temperature of the oil-cooled motor, and adjust the working gear of the oil pump according to the working temperature; Obtain the working current of the oil-cooled motor and the temperature rise rate of the working temperature, where the temperature rise rate is the temperature rise value per unit time, and increase or decrease the gear on the current working gear of the oil pump according to the working current and the temperature rise rate; Among them, the increasing or decreasing of the gear on the current working gear of the oil pump according to the working current and the temperature rise rate includes: When the working current is greater than or equal to the preset current threshold and the temperature rise rate is positive, increase the gear on the current working gear of the oil pump; When the temperature rise rate is negative, decrease the gear on the current working gear of the oil pump; The step that when the working current is greater than or equal to the preset current threshold and the temperature rise rate is positive, increase the gear on the current working gear of the oil pump includes: When the working current is less than the first current threshold and lasts for the first preset time, and the temperature rise rate is less than the first temperature rise rate threshold and lasts for the second preset time, maintain the current working gear of the oil pump; When the working current is greater than or equal to the first current threshold and lasts for the first preset time, or the temperature rise rate is greater than or equal to the first temperature rise rate threshold and less than the second temperature rise rate threshold and lasts for the second preset time, perform an operation of increasing one gear on the current working gear of the oil pump; When the working current is greater than or equal to the second current threshold and lasts for the first preset time, or the temperature rise rate is greater than or equal to the second temperature rise rate threshold and lasts for the second preset time, perform an operation of increasing two gears on the current working gear of the oil pump; The second current threshold is greater than the first current threshold; the second temperature rise rate threshold is greater than the first temperature rise rate threshold.

2. The control method for the oil pump of the oil-cooled motor according to claim 1, Characterized in that, The adjustment of the working gear of the oil pump according to the working temperature includes: When the working temperature is less than or equal to the first temperature threshold, adjust the working gear of the oil pump to the first gear; when the working temperature is less than the second temperature threshold and greater than or equal to the first temperature threshold, adjust the working gear of the oil pump to the second gear; when the working temperature is less than the third temperature threshold and greater than or equal to the second temperature threshold, adjust the working gear of the oil pump to the third gear; when the working temperature is greater than or equal to the third temperature threshold, adjust the working gear of the oil pump to the fourth gear; The oil pump speeds of the first gear, the second gear, the third gear, and the fourth gear increase in sequence.

3. The control method for the oil pump of the oil-cooled motor according to claim 1, Characterized in that, The step that when the temperature rise rate is negative, decrease the gear on the current working gear of the oil pump includes: When the temperature rise rate is greater than the third temperature rise rate threshold and lasts for the second preset time, maintain the current working gear of the oil pump; When the temperature rise rate is greater than or equal to the fourth temperature rise rate threshold and less than the third temperature rise rate threshold and lasts for the second preset time, perform a one-gear-down operation on the current working gear of the oil pump; When the temperature rise rate is less than or equal to the fourth temperature rise rate threshold and lasts for the second preset time, perform a two-gear-down operation on the current working gear of the oil pump; The first temperature rise rate threshold is greater than the third temperature rise rate threshold which is greater than the fourth temperature rise rate threshold.

4. The oil pump control method for an oil-cooled motor according to claim 1, characterized in that, The temperature rise rate lasting for the second preset time includes: Only obtain the temperature rise rate once within the second preset time, and regard the temperature rise rate as the temperature rise rate sustained within the second preset time; Or obtain the temperature rise rate several times within the second preset time.

5. The oil pump control method for an oil-cooled motor according to claim 1, characterized in that, The upshifting or downshifting on the current working gear of the oil pump according to the working current and the temperature rise rate further includes: When the working current is less than the first current threshold and lasts for the first preset time, and the temperature rise rate is positive and less than the fifth temperature rise rate threshold and lasts for the second preset time, perform a one-gear-down operation on the current working gear of the oil pump; the fifth temperature rise rate threshold is less than the first temperature rise rate threshold; When the temperature rise rate is negative and greater than the sixth temperature rise rate threshold and lasts for the second preset time, perform a one-gear-up operation on the current working gear of the oil pump; the sixth temperature rise rate threshold is greater than the third temperature rise rate threshold.

6. The oil pump control method for an oil-cooled motor according to claim 1, characterized in that, The upshifting or downshifting on the current working gear of the oil pump according to the working current and the temperature rise rate includes: When the working current is greater than or equal to the third current threshold and lasts for the first preset time, and the temperature rise rate is negative and greater than the seventh temperature rise rate threshold and lasts for the second preset time, perform a one-gear-up operation on the current working gear of the oil pump; The third current threshold is greater than or equal to the second current threshold; the seventh temperature rise rate threshold is greater than or equal to the third temperature rise rate threshold.

7. An oil pump control device for an oil-cooled motor based on driving mode prediction, which executes according to the oil pump control method according to any one of claims 1-6, characterized in that, The oil pump control device includes a data acquisition module and a processing module; The data acquisition module acquires the working temperature of the oil-cooled motor, and the processing module adjusts the working gear of the oil pump according to the working temperature; The data acquisition module acquires the working current of the oil-cooled motor and the temperature rise rate of the working temperature, the temperature rise rate is the temperature rise value per unit time, and the processing module performs upshifting or downshifting on the current working gear of the oil pump according to the working current and the temperature rise rate.

8. A vehicle, characterized in that, The oil pump control method of the oil-cooled motor according to any one of the above claims 1-6 is used to control the oil pump.

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